58 ORCHIDACEAE 



PoUinia not produced into caudicles. 

 PoUinia granulose or powdery. 



Anthers operculate; leaves alternate. 



Green plajits, with large leaves. 9. Sehapias. 



Plant white, turning brownish; leaves reduced, scale-like. 



10. Ebubophtton. 

 Anthers not operculate. 



Leaves green, borne on the stem. 



Leaves alternate; spike mostly twisted. 11. iBiDltJM. 



Leaves 2, opposite; spike not twisted. 12. Ophbys. 



Leaves usually white-reticulate, basal. 13. Pehamtcm. 



PoUinia smooth or waxy. 



Plants with corms or soUd bulbs, rarely with coralloid roots; leaves not scale- 

 Uke. 

 Leaves unfolding before or with the flowers. 

 Lip flat; flowers racemed. 



Leaves cauline; column short; pollinia clavate. 



14. Malaxis. 

 Leaves basal; column elongated; pollinia globose. 



15. LIPAKIS. 



Lip saccate; flower solitary. 16. Cytherea. 



Leaf 1, unfolding after the flowering time. 17. Aplectrdm. 



Plants with coralloid roots,. bulbless; leaves reduced to scales. 



18. CORALLORBHIZA. 



1. CRIOSANTHES Raf. Ram's-hbad, Ram's-hbad Ladies' Slipper. 



1. C, arietinum. 



2. CYPRIPEDIUM L. Ladies' Slipper. 



Leaves alternate; flowers solitary, terminal, or also several singly in the axils of the 

 upper leaves. 

 Sepafe obovate to broadly obovate or oval, not longer than the lip; sterile stamen 

 elliptic-cordate. 1. C. passerinum. 



Sepals lanceolate, attenuate, often longer than the lip. 



Lip white, purple-veined; sterile stamen ovate or obovate. 2. C. montanum. 



Lip yellow; sterile stamen triangular, yellow and purple-spotted. 



Lip 2-2.5 cm. long, broader than deep; lower sepal narrower than the upper 

 one, exceeding the Up. 3. C. parviflorum. 



Lip 3-4 cm. long, deeper than broad; lower sepal fully as broad as the upper 

 one or broader, usually shorter than the lip. 4. C. veganum. 



Leaves 2, opposite or nearly so; flowers usually several in a contracted bracted spike. 



5. C. Knightae. 



3. ORCHIS (Tourn.) L. Orchis. l. O. rolundifolia. 



4. COELOGLOSSUM Hartman. l. C. bracteatum. 



5. LYSIAS SaHsb. 



Leaves orbiculai or rounded oval; spur slightly clavate at the apex. 1. L. orbiculata. 



Leaves oval or ovate; spur strongly clavate and curved at the apex. 2. L. Menziesii. 



6. L7SIELLA Rydb. l. l. obtusata. 



7. LIMNORCHIS Rydb. Bog Orchid. 



Lip more or less lanceolate, i. e., broad near the base. 



Flowers greenish or purplish; lip not rhombic at the base. 



Spur decidedly clavate, thickened and obtuse at the apex, shorter than the lip. 

 Petals purpUsh; spur only one-half to two-thirds the length of the lip, very 

 saccate. 

 Lip linear or nearly so, 5-7 mm. long ; ovary slightly curved ; spike usually 



elongated. 1. L. stricta. 



Lip lanceolate, fleshy, 4-5 mm. long; ovary strongly curved; spike usually 

 short. 2. L. purpurascens. 



Petals greemsh; spur almost equalling the lip. 3. L. viridiflora. 



Spur slender, scarcely thickened at all towards the apex, often acutlsh, equal- 

 ling or slightly exceeding the lip; plant tall and stout; flowers comparatively 

 large; sepals 4r-a mm. long. 4. i. media. 



Flowers white or nearly so; lip lanceolate, decidedly dilated, subrhombic at the base. 

 Spur only slightly if at all exceeding the lip. 



Spur usually shorter than the lip and clavate. 5. £,. borealis 



Spur equallmg or slightly exceeding the Up, slightly or not at aU clavate. 

 r. ^ , i, .^ i ., . , , 6. L. dilatala. 



Spur from one-foiu-th to two-thirds longer than the Up. 7. L. leucostachvs 



Lip linear, i. e., not at all dilated at the base. 



Spur shorter than the Up, decidedly saccate. 1. £,. stricta 



Spur much exceeding the Up, filiform. 



Spike comparatively dense. 8. L. ensifolia 



Spike very lax. 9. i. laxiflora. 



